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Information × Registration Number 0221U105315, 0119U100176 , R & D reports Title Spin-dependent processes in crystals and nanostructures, development the projective representation methods of symmetry groups for their interpretation. popup.stage_title Head Gubanov Viktor О., Доктор фізико-математичних наук Registration Date 25-06-2021 Organization Taras Shevchenko National University of Kyiv popup.description2 The object of research is crystals of cubic and hexagonal syngony, linear π-electron conjugate systems, one- and two-dimensional carbon graphite structures and their inorganic analogues, nanocomposites based on them. The aim of the work is to study the energy spectra of elementary excitations in crystals, nanostructures and nanocomposites and their interpretation with the involvement of advanced methods for constructing projective representations of symmetry groups and methods of quantum chemistry. Research methods - methods of symmetry group theory, Raman spectroscopy, spectrophotometry, photoluminescence, methods of quantum chemistry. The correlation of oscillatory modes, their dispersion and dispersion dependences of electronic excitations without taking into account the electron spin and with its taking into account in diamond, silicon and germanium crystals have been studied. For projective representations of all projective classes of a cubic system, standard factor systems were constructed for the first time, including factor systems for electronic states were determined for the first time, by which correct spinor multiplication tables were found for the first time. the existence of spin-dependent fission of energy electronic spectra has been established. Using the methods of quantum chemistry for linear π-electron conjugate systems, diagrams of the energy levels of electronic excitations are constructed and their electronic configuration is determined. The obtained results were used to interpret the absorption and fluorescence spectra of the respective systems.  Product Description popup.authors Gryn Dmytro V. Korniyenko Mykola Ye. Navozenko Oleksandr M. Naumenko Antonina Р. Sabov Maksym M. Yahnenko Marianna S. popup.nrat_date 2021-06-25 Close